Hi, I'd like to be able to set a register directly from my c code. I'm using the llvm compiler in a x86_64 build/run environment. When I compile and link the following code I get no errors or warnings: I used the thread_create_running function and during setup set the r11 register to 0xBEAD as a start state using x86_thread_state64_t . ///snippet---- at the very start of my thread I have the following tidbit of code: register uint64_t r11 asm("r11"); r11=0xfade; // some value -- don't care about the value, just want my value set. //end snippet Each time I run, my code crashes in what looks to be random locations, but its always my thread. However R11 is always set to 0xBEAD. Am I missing something or is there something else I need to do to set r11 to a new value? Gordo _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.... This email sent to site_archiver@lists.apple.com